Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 20

Installation sequence
Hydraulic connections
2.
4x
Fig. 15
Straight pipe sections supplied
A
Pipe bends from primary circuit/secondary circuit
B
connection set (accessories): See separate instal-
lation instructions.
Connecting the primary circuit
!
Please note
The heat transfer medium can cause corrosion
damage to on-site lines and components.
The components and lines used must be resist-
ant to the heat transfer medium. Never use zinc-
plated/galvanised pipes.
1. Equip the primary circuit with an expansion vessel
and safety valve (in accordance with DIN 4757).
Note
■ The expansion vessel must be approved to
DIN 4807. The diaphragms of the expansion ves-
sel and safety valve must be suitable for the heat
transfer medium.
■ The blow-down and drain pipes should terminate
in a container. This container must be able to
hold the maximum possible expansion volume of
the heat transfer medium.
2. Ensure adequate thermal and anti-vibration insula-
tion of all pipes routed through walls.
20
(cont.)
A
B
1.
4x
3. Connect primary pipes to heat pump.
!
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibration and appliance dam-
age.
Connect on-site lines so that they are free of
load and torque stress.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
Ensure the diaphragm grommets at the pipe
entries are seated correctly. Seal pipe
entries with sealing tape if necessary.
4. Insulate pipes inside the building to prevent heat
and vapour diffusion.
Connecting the secondary circuit
E F
D C
Fig. 16 Safety assembly supplied
Pressure gauge
C
Connection G 1
D
Quick-action air vent valve
E
Safety valve
F
1. Equip the secondary circuit on site with an expan-
sion vessel and the safety assembly supplied (in
accordance with DIN 4757).
Fit the safety assembly to the on-site line in the
heating water return.
or
Fit the safety assembly to the primary circuit/
secondary circuit connection set (accessories).
Connection set installation instructions